var Name = function () {
    this.name = 'ganzhibin'
  }
  var obj = new Name()
  console.log(obj.name) // ganzhibin



var Name = function () {
    this.name = 'ganzhibin'
    return { // 显示返回一个对象
        name: 'this is myName'
    }
}
var obj = new Name()
// 输出 this is myName，而不是上面的 ganzhibin
console.log(obj.name) // this is myName